Form for concrete pipes



F. H. WEAVER. FORM FOR CONCRETE PIPES.

APPLICATION FILED JULYIZ, 1921.

Patefited July 18, m2.

. mart FREDERICK H. "WEAVER, OF NEW YORK, N. Y.

FORM FOR concnn'rn rrrns.

Application filed July l2,

To all whom it may concern:

Be it knownthat I, FREDERICK I-I. IVEAVER, a citizen of the UnitedStates, residing at New York, in the county of New York and State of NewYork, have invented certain new and useful Improvements in Forms forConcrete Pipes, of which the following is a specification.

This invention relates to improvements in a device for formingreinforced concrete pipes and has a special reference to a formation ofa bell and spigot ends of said pipe.

A further object of my invention is to' provide a form with reinforcedrings for the forming of the bell andspigot ends and which can bereadily moved from the pipe after they have become set without danger ofbreakage either to the pipe or to the said rings.

The invention consists of the novel construction and arrangement of theparts and combination of parts hereinafter more fully set forth in thefollowing specification and pointed out in detail in the appendedclaims.

In the accompanying drawing,

- Figure 1 is a vertical longitudinal section of the complete form, thebase of which is partly broken away.

Figure 2 is a section on the line 22 of Fig. 1.

Referring to the accompanying drawing forming part of this specificationin which I like reference numerals designate like parts throughout theseveral views thereof, 1 designates a base which is provided with anannular shoulder 2 on its outer edge, and a tapered portion 3 .whichlatter is provided with a central aperture 4. The outer casing 5 of theform rests on the base 1 and against.

the shoulder 2 and the inner casing 6-rests on the upper edge of thetapered portion 3 and is held in position by the tapered pins 7 whichproject through the apertures 8 in the base 1. The said pins 7 beingforced through the apertures 8 from the bottom and being tapered can bereadily driven downwardly by a suitable tool when it is desired toremove same in order to remove the inner casing 6. The tapered portion 3of the base 1 is provided with two split spring-rings 9 which are heldtogether in their relative position by the webs 10. The said splitspring-rings 9 are normally contracted and when forced over the taperedportion 3 expand until they are forced down against the pins 11 when theends properly overlap Specification of Letters Patent.

Patented July 18, 1922.

1921. Serial No. 484,037.

as shown in Fig. l. The pins 11 are tapered so that they can bewithdrawn from the inside of the base 1. The split spring-rings 9 formthe grooves in the bell end of the pipe which latter is formed by theconcrete packed between the forms 5 and 6. After the concrete is packedbetween the forms 5 and 6 up to the upper edge of the outer form 5 thetapered cap 12 is fitted over the outer casing 5 and is held thereto bythe shoulder 13. Within the cap 12 are two split springrings lt whichare held in their proper rela tive position by the webs 15. The saidsplit spring-rings 1e are normally extended and when forced into the cap12 are caused to expand against the inner surface of the cap 12 to holdthem in their proper position. The said split spring-rings 14 form thegrooves in the spigot end of the pipe.

It will thus be seen that after the con crete is packed between theforms 5 and 6 and has thoroughly set, the cap 12 is removed which leavesthe split spring-rings 14: in the concrete form of said pipe and aslight tap on said rings lt with a suitable tool to cause the ends tospring apart so that they can be readily removed. The pins 9 7 aredriven'through the base 1 by a suitable tool which permits the innercasing 6 to be removed. The pipe is then turned down and after the pins11 have been withdrawn the base 1 can be removed which leaves the splitspring-rings 9 in the concrete pipe and a slight tap on said rings 9will cause the ends of the latter to slip past each other into acontracted position so that it can be 2. A device for forming concretepipes comprising a base having an annular shoulder on its outer edge anda tapered upwardly projecting portion, and two split spring-ringsadapted to fit around said tapered portion of said base and held thereonby friction.

3. A device for forming concrete pipes wardly projecting tapered portionof said base and held thereon by friction, an outer casing restingousaid base and against said shoulder, an inner casing resting upon thetop of said tapered portion of said base, a cap fitted over the top ofsaid outer casin and having an upwardly projecting tapered portion andtwo split spring-rings fitted on tlie inner surface of said cap and heldthereon by friction. y

In testimony whereof I afiix my signature.

FREDERICK H. WVEAVER.

